1. Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907
2. Department of Veterinary Pathobiology, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907
3. Pathobiology Laboratory, National Veterinary Services Laboratories, Veterinary Services, Animal and Plant Health Inspection Service, US Department of Agriculture, Ames, IA 50010
4. Emerging Bacterial and Mycotic Diseases Branch, Division of Bacterial and Mycotic Diseases, Centers for Disease Control, Atlanta, GA 30333